Grindstone attachment.



Np. 888,971. PATENTED MAY 26, 1908.

J. M. DRAKE.

GRINDS TONE ATTACHMENT. APPLIQATION FILED DEO.11, 1907.

' 23 i hwana mwa m I srarns JOHN M. DRAKE, OF WEST HARTFORD, CONNECTICUT.

- GRINDS TONE ATJM-LCHIIMIIENT.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed December 11, 1907? Serial No. 406,071.

that l; Jenn M. DRAKE, a of GreatBritain, residing d, in the county of Hartford and St e ofConnecticut, have invented new and useful improvements in Grindstone Attachn'lents, of which the following is a specificationv This invention relates to grindstone attachments, and particularly to an attachment whereby bush hammer blades, chisels, plain blades ofdvarious kinds and edged tools may be held in a convenient manner to be ground and adjusted laterally and vertically with respect to the stone, as occasion may' require in the grinding operation, and whereby power may be applied to force the blade with a heavy pressure against-the stone, thereby enabling thick blades to be readily and evenly ground. v The object of the invention is to provide a device of this character which maybe conveniently applied to any ordinary grindstone frame, which may be quickly removed when its use is not desired, which may be produced atarcc'innaratively low cost, and which will save time and labor in shops where heavy blades or a large number-of blades are constantly being sharpened.

The invention consists of the features of construction, combination and arrangement "of parts hereinafter described and claimed, --reference being had to th e accompanying drawing, in wlnch:- I Figure 1 18 a side elevation of a grindstone having my attachment applied thereto.

Fig. 2 is a sectional end elevation thereof.

3 is a side view of the work holder or tongs. detached. Fig. 4. is a plan view of the same. Fig. 5 is a view showing a modifica- .tion.

' Referring to the drawing, the numeral 1' designates the frame of anordinary grindstone, upon which the stbne 2 is revolubly' mounted, which stone may be operated by hand, footer other power The attachment is mounted in practice upon one end of the frame 1 and comprises a supporting frame in the form of a pair of brackets 3 preferably of U-form to encoma pass, bear and rest upon the upper d lower f 'surfaces and outer sides of the upper longitudinal bars of said frame 1, the lower arms of saidbrackets being inwardly extended and bent downwardly to provide apertured ears ff=fi30111166t$d by. a bolt or other suitable fas-.

tening 5. From the upper arms of the U shaped brackets extend vertical parallel standards 6, each provided with a'series of transverse openings 7, .the'openings in the standards being arranged in alinement with each other.

'ljhe standards are connected by a transverse tie rod or bolt 8 passing through one of the series of openings in each standard, one end of the bolt being headed to bear against the out-er surface of one standard, while the other end of the bolt is threaded, as at 9, to receive a clamping nut 10, by which the bolt is secured from disconnection and the standards rigidly tied together. A l t will thus be seenthat the upper and. lower bolts QlQLQChSIbI-Y*"SECIIT6-E ;LQ. galls of the frame of the work holder firmly inmosition upon the frame of the grindstone, and that the construction of the work holder is such as to adapt it to'beapplied to any ordinary form of grindstone frame and to be conveniently rem'oved therefrom when occasion requires. As shown in Fig. 5, the ear 4 on each bracket may be dispensed with and the bracket secured to the frame by aset-screw 5 A clamp or work holder is pivotallyand slidably mounted upon the bolt 8, which forms a supporting arbor therefor,.and in the form shown embodies a pair of tongs or clamping members i 11 and 12 which are crossed in, the customary manner adjacent their forward ends vand pivotally connected, as [a 13, and provided with cooperating clamping jaws 14 and 15, Y The rear ends of the tongs form the usual operating handles 16 and 17, which may be of any desired length for application of the required amount of clamping power. The member 12 is pro vided at a point below the pivot 13 with an apertured lug or car 18 which depends therefrom and slidably and pivotally engages the arbor 8, thus enabling the work holder, be-

tween the jaws 14 and 15 of which the article to be sharpened is held, to be adjusted lat erally and vertically with respect to the face of the stone 2 to enable the article to be manipulated and ground withfacility.

it will be understood by the construction described that the arboror pivot bolt 8 may be mounted at difierent elevations upon the work. holder frame by passing it through different alined openings 7 in the standards 6,

thus providing, for the; adjustment of the" tongs to hcldobjects'to be shar ened which vary in length er thickness. '1 e article to be sharpened is clamped between the jaws 1 4and 15 by drawing the handles 16 and 17 together, and through the medium of the latter a firm and effective clamping action maybe-obtained." By pivotally and slidably mounting the tongs upon the arbor, the article may not only be adjusted laterally and vertically in the manner before described, but a high forcing pressure or leverage may be exerted by upward pressure on the handles of the tongs to hold the article with maximum force against the face of the wheel, thereby enabling thick and heavyedged tools to be sharpened with convenience. v w

From theforegoing description; taken in connection with the accompanying drawin the construction, mode of operation and 'a vantages of my im roved attachment will be readily understoo and it will be-apparent that by it's use a material amount of time and labor may be. saved in the operation of sharpening heavytools and a large number of tools at more or less frequent intervals. Having thus fully describ d the invention, what is claimed as new is 2 1. A work holding attachment for grindstones comprising a supporting frame, and a, work holder embodying clampin jaws having operatin handles, one of sai jaws being ivotally an vslidably mounted on said frame for adjustment respectively toward and from the stone and laterally of the face thereof, and the other jaw being -pivotally mounted and laterally of the face thereof, and handles connected with the jaws for the manual mani ulation thereof.-

, 3. n'awork holding attachment for grindstones, the combination of a frame having a grindstone journaled thereon, standards carried by the frame on opposite sides of the line of the grindstone, a transverse rod carried by said standards, said rods 'being adjustable vertically on the standards to different operative positions, and a work holder pivotally 'mounted on said rod for adjustment toward and from. the stone and slidablymounted on the rod for movement laterally of the face of the stone, said {holder comprisin a pair of ivotally connected jaws, one of said jaws eing shdably and pivotally-mounted on the rod, and both of said jaws being provided with handles-for manual manipulation. In testimonywherecf I affix my signature- .in presence of two witnesses.

. JOHN M. DRAKE; Witnessesz A. B. WILsoN, MARIE R. PRUTTING. 

